Is Warrensburg, IL Tap Water Safe to Drink?
Graded B- — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
70.4/100
waterverge.com Warrensburg, IL — Water Quality Report
Warrensburg's drinking water received a grade of B- (70.4 out of 100), indicating fair water quality. The city's 1 water system serves approximately 1,230 residents using groundwater.
Lead levels were measured at 7.0 ppb (90th percentile), which is within EPA limits but above recommended levels. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 18 violations on record, including 4 health-based violations. 8 remain unresolved.
What to know about Warrensburg's water
Warrensburg ranks #736 out of 891 cities in Illinois for water quality, placing it among the lowest-rated in the state.
Warrensburg relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
While lead levels are within EPA limits, they are above the recommended 5 ppb threshold that health organizations consider ideal. A point-of-use filter adds an extra layer of protection.
As a small community water system, Warrensburg may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Warrensburg, IL water safe to drink?
Warrensburg's drinking water has significant quality concerns based on EPA testing data. With a grade of B- (70.4/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 1,230 residents using groundwater (wells).
Recent water quality updates for Warrensburg
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Warrensburg's water quality assessment. Grade: B- (70.4/100).
Contaminants: Public Notice.
Contaminants: LEAD AND COPPER RULE REVISIONS, Consumer Confidence Rule.
1 health-based. Contaminants: LEAD AND COPPER RULE REVISIONS.
Federal disaster declaration (FEMA DR-3230). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-583). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Warrensburg's water supply.
Within EPA limits but above the American Academy of Pediatrics recommended level of 1 ppb. An NSF 53-certified filter provides additional protection.
Exceeds EPA action level. Copper can leach from household plumbing — flush taps for 30 seconds before drinking.
Violation history
Warrensburg's water system has 18 total violations on record, including 4 health-based violations. 8 remain unresolved. 4 violations were issued in the last 5 years.
Flood & environmental risk
Macon County has experienced 3 federally declared disasters since 1974. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies. Local water sources include Sangamon River.
Where does Warrensburg's water come from?
Warrensburg's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 1,230 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Sangamon River (river).
What Warrensburg residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Warrensburg's water.
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Run cold water for 30 seconds before drinking, especially in the morning. Lead and copper leach from household plumbing when water sits in pipes.
Warrensburg's area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Top industrial polluters within 10 miles of Warrensburg
Industrial polluters nearby
Reported releases to surface water by facilities near Warrensburg, ranked by pounds discharged annually.
Total reported releases to surface water: 14,935 lbs
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
PRIMARY PRODUCTS INGREDIENTS AMERICAS LLC - DECATUR DECATUR, IL62521 | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 14,935 | 9.2 mi |
INTERNATIONAL CONTROL SERVICES INC. DECATUR, IL62521 | — | — | 9.6 mi |
CATERPILLAR INC. DECATUR FAC. DECATUR, IL62526 | — | — | 8.6 mi |
DECATUR FOUNDRY INC DECATUR, IL62526 | — | — | 8.1 mi |
MUELLER CO-PLANT #1 DECATUR, IL62522 | — | — | 8.0 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Macon County has experienced 3 federally declared disasters since 1974. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Warrensburg's water supply, we recommend the following filter types.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 7.0 | 15 | ppb | Inorganic | Safe |
| Copper (90th percentile) CopperInorganic A metal that enters drinking water mainly through corrosion of copper plumbing. Small amounts are essential for health, but excess levels are harmful. Health EffectsGastrointestinal distress (nausea, vomiting, diarrhea) at short-term high levels; liver and kidney damage from long-term exposure. EPA Limit1.3 mg/L action level Common SourcesCorrosion of copper household plumbing, erosion of natural deposits. | 1.90 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level trend (90th percentile)
See how Warrensburg compares by contaminant
Explore where Warrensburg ranks among all Illinois cities for specific contaminants.
Water source & infrastructure
Where Warrensburg's water comes from
Warrensburg's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by local government ownership and serves approximately 1,230 people through 1 water system.
Water bodies near Warrensburg
Warrensburg is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Warrensburg
| System Name | PWSID | Population | Source |
|---|---|---|---|
| WARRENSBURG | IL1150500 | 1,230 | GW |
How Warrensburg compares
Full Illinois rankings →Warrensburg's score of 70.4/100 is above the average of 56/100 among major Illinois cities. It outscores 7 of 10 nearby cities.
Nearby cities
View Illinois rankings →About Warrensburg, IL
Wikipedia →Warrensburg is a village in Macon County, Illinois, United States. Its population was 1,110 at the 2020 census, down from 1,201 in 2010. It is included in the Decatur, Illinois Metropolitan Statistical Area. Warrensburg was established in 1841.
Learn more about your water
Guides and resources related to Warrensburg's water quality findings.
Explore water quality across Macon
Frequently asked questions
Is Warrensburg, IL tap water safe to drink?
Warrensburg's water quality earned a grade of B- (70.4/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #736 out of 891 cities tested in Illinois.
What contaminants are in Warrensburg's water?
Lead was measured at 7.0 ppb (90th percentile). 18 violations are on record.
How is Warrensburg's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Warrensburg?
While lead levels are within EPA limits, a filter adds extra protection. Based on current data, basic filtration should suffice for additional peace of mind.
Where does Warrensburg's water come from?
Warrensburg's water is sourced from Groundwater. The city has 1 water system serving approximately 1,230 residents.
What health violations has Warrensburg's water system had?
Warrensburg has 4 health-based violations on record. The most recent violation was recorded in August 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 8 violations remain unresolved.
Is Warrensburg's groundwater at risk of contamination?
Warrensburg uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 18 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Warrensburg's water compare to other cities?
Warrensburg ranks #736 out of 891 cities in Illinois (better than 17% of state cities) and #10744 out of 15744 cities nationally (32th percentile). The grade of B- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Warrensburg's small water system affect quality?
Warrensburg's system serves approximately 1,230 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 18 violations on record.